OBD-II code · Chassis
C0090 Hydraulic Brake Pressure Sensor Circuit
The brake pressure sensor in the master cylinder or hydraulic block reports an implausible signal or no signal. The fault disables ABS, stability control and brake assist.
Is it safe to drive with C0090?
Usually safe for short trips, but don’t ignore it: the underlying fault can get more expensive over time.
Common causes
- Most likelyPressure sensor element failed
- PossibleSensor wiring fault
Symptoms
- ABS warning light on
- ESC/stability control deactivated
- Possible reduced brake assist
- Speedometer may behave erratically
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–3.5 h
- Emissions test
- Usually unaffected
- Parts involved
- Brake Pressure Sensor, ABS Control Module, Sensor Wiring
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.